fn print_refs(x: &i32, y: &i32) {
    println!("x is {} and y is {}", x, y);
}

// fn failed_borrow<'a>() {
//     let _x = 123;
//     let y: &'a i32 = &_x;
// }

fn main() {
    let (four, nine) = (4, 9);
    print_refs(&four, &nine);
    // failed_borrow();
}
